像 Twitter 关注者/在 ActiveRecord 中被关注的关系 [英] Relationship like Twitter followers/followed in ActiveRecord

问题描述

我试图在我的应用程序中表示用户之间的关系，其中一个用户可以有很多关注者并且可以关注其他用户.我想要像 user.followers() 和 user.followed_by() 这样的东西你能详细告诉我如何使用 ActiveRecord 来表示吗?

I'm trying to represent a relationship between users in my application where a user can have many followers and can follow other users. I would like to have something like user.followers() and user.followed_by() Could you please tell me in details how to represent this using ActiveRecord?

谢谢.

推荐答案

你需要两个模型，一个 Person 和一个 Follows

You need two models, a Person and a Followings

rails generate model Person name:string
rails generate model Followings person_id:integer follower_id:integer blocked:boolean

以及模型中的以下代码

class Person < ActiveRecord::Base
  has_many :followers, :class_name => 'Followings', :foreign_key => 'person_id'
  has_many :following, :class_name => 'Followings', :foreign_key => 'follower_id' 
end

和你写的Follows类对应

and corresponding in the Followings class you write

class Followings < ActiveRecord::Base
  belongs_to :person
  belongs_to :follower, :class_name => 'Person'
end

您可以根据自己的喜好使名称更清晰(我特别不喜欢 Followings-name)，但这应该可以帮助您入门.

You could make the names clearer to your liking (i especially don't like the Followings-name), but this should get you started.

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